Apparatus and method for forming hydrogen tank and assembling method thereof

Abstract

An embodiment change core module of an injection mold for a hydrogen tank liner that is injection molded is provided. The change core module includes upper and lower change cores configured to hold a sealless nozzle inside the injection mold, wherein the injection mold comprises upper and lower molds, and wherein the sealless nozzle has a first temperature, and an induction heating device configured to inductively heat the sealless nozzle to a second temperature.

What is claimed is: 
     
         1 . A change core module of an injection mold for a hydrogen tank liner that is injection molded, the change core module comprising:
 upper and lower change cores configured to hold a sealless nozzle inside an injection mold, wherein the injection mold comprises upper and lower molds, and wherein the sealless nozzle has a first temperature; and   an induction heating device configured to inductively heat the sealless nozzle to a second temperature.   
     
     
         2 . The change core module of  claim 1 , wherein a distance between the induction heating device and the sealless nozzle is 10 to 15 mm. 
     
     
         3 . The change core module of  claim 1 , wherein the second temperature is 160° C. or higher. 
     
     
         4 . The change core module of  claim 3 , wherein, in a state in which the sealless nozzle is the second temperature as measured by an induction heating inlet line configured to apply electricity to the induction heating device, a liner is configured to be molded from resin injected through a space between the upper and lower molds and a space between the upper and lower change cores. 
     
     
         5 . The change core module of  claim 1 , wherein the induction heating device comprises a coil arranged in parallel. 
     
     
         6 . The change core module of  claim 5 , wherein the coil of the induction heating device is arranged such that there is no variation in vector in a current flow. 
     
     
         7 . The change core module of  claim 1 , wherein the induction heating device comprises a coil arranged into two or more parallel channels. 
     
     
         8 . The change core module of  claim 7 , wherein the two or more parallel channels define a zigzag curve. 
     
     
         9 . A change core module coupling apparatus of an injection mold for a hydrogen tank liner that is injection molded with a sealless nozzle positioned in the injection mold by upper and lower change cores, wherein the injection mold comprises upper and lower molds, the change core module coupling apparatus comprising:
 a horizontal movement pin configured to be built into the lower change core and horizontally moved by an ejector pin on a bottom plate; and   a vertical movement pin configured to be built into the lower change core, vertically moved by the horizontal movement pin, and inserted into a coupling hole of the upper change core.   
     
     
         10 . The change core module coupling apparatus of  claim 9 , wherein a driving slope of the horizontal movement pin and a driven slope of the vertical movement pin correspond to each other to slide. 
     
     
         11 . The change core module coupling apparatus of  claim 9 , wherein the vertical movement pin is elastically supported by a compression spring. 
     
     
         12 . The change core module coupling apparatus of  claim 9 , wherein the vertical movement pin is radially embedded in the lower change core and moves in a radial direction of the lower change core. 
     
     
         13 . The change core module coupling apparatus of  claim 9 , wherein a slot hole is disposed at a top of the vertical movement pin. 
     
     
         14 . The change core module coupling apparatus of  claim 13 , wherein the upper change core has a built-in slit bar penetrating the coupling hole in a radial direction. 
     
     
         15 . The change core module coupling apparatus of  claim 14 , wherein, in a state in which the slot hole of the vertical movement pin is inserted into the coupling hole, the built-in slit bar penetrates the slot hole to fix the vertical movement pin. 
     
     
         16 . A method of forming a hydrogen tank liner, the method comprising:
 positioning a sealless nozzle in an injection mold comprising upper and lower molds using a change core module, the change core module comprising upper and lower change cores holding the sealless nozzle inside the injection mold; and   inductively heating the sealless nozzle from a first temperature to a second temperature using an induction heating device of the change core module.   
     
     
         17 . The method of  claim 16 , wherein a distance between the induction heating device and the sealless nozzle is 10 to 15 mm. 
     
     
         18 . The method of  claim 16 , wherein the second temperature is 160° C. or higher. 
     
     
         19 . The method of  claim 18 , further comprising, after inductively heating the sealless nozzle to the second temperature, injecting a resin through a space between the upper and lower molds and a space between the upper and lower change cores to begin molding a liner injection molded product. 
     
     
         20 . The method of  claim 16 , wherein the induction heating device comprises a coil arranged in parallel.